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arXiv 1907.06307math.AP
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一类抛物型方程组弱解的正则性

Regularity of weak solutions to a certain class of parabolic system

Zhong Tan, Jianfeng Zhou

摘要:

研究了一类二阶抛物型方程组的弱解的正则性。利用$A-$热近似证明了该系统的弱解$u$是局部Hölder连续的,且其指数$α\in(0,1)$在零抛物测度的奇异集之外.特别地,我们证明了$Q_T$中的正则点是一个满测度的开集,并得到了弱解在给定点邻域内正则的一般判据.最后,我们推导了$D u$的分数时间可微性和分数空间可微性,并在此基础上得到了$u$的奇异集的豪斯多夫维数.

英文摘要:

We study the regularity of weak solutions to a certain class of second order parabolic system under the only assumption of continuous coefficients. By using the $A-$caloric approximation argument, we claim that the weak solution $u$ to such system is locally Hölder continuous with any exponent $α\in(0,1)$ outside a singular set with zero parabolic measure. In particular, we prove that the regularity point in $Q_T$ is an open set with full measure, and we obtain a general criterion for a weak solution to be regular in the neighborhood of a given point. Finally, we deduce the fractional time and fractional space differentiability of $D u$, and at this stage, we obtain the Hausdorff dimension of singular set of $u$.

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